import webbrowser
class TaskAlreadyExistsError(Exception):
"""Exception raised when a task already exists in the list."""
def __init__(self, message):
super().__init__(message)
class TaskNotFoundError(Exception):
"""Exception raised when a task is not found in the list."""
def __init__(self, message):
super().__init__(message)
class ToDo:
"""Class representing a to-do list."""
def __init__(self) -> None:
"""Initialize an empty to-do list. Which is a dictionary"""
self.tasks = {}
def add_task(self, task:str, deadline:str) -> str:
"""Add a new task to the list.
Args:
task (str): The task description.
deadline (str): The deadline in dd-mm-yy format.
Returns:
str: A confirmation message indicating that the task has been added.
Raises:
TaskAlreadyExistsError: If the task already exists in the list.
TypeError: If the task parameter is not a string.
ValueError: If the task parameter is an empty string.
"""
if not isinstance(task, str):
raise TypeError("Task must be a string.")
if not task:
raise ValueError("Task cannot be an empty string.")
if task in self.tasks.keys():
raise TaskAlreadyExistsError(f"{task} already exists in the list.")
else:
self.tasks[task] = {'status':False, 'deadline':deadline}
print(self.tasks)
return f"Task has been added to the list."
def finish_task(self, task:str) -> str:
"""
Mark a task as finished and open a web page for celebration.
Args:
task (str): The task to mark as finished.
Returns:
str: A message confirming that the task has been marked as finished.
Raises:
TypeError: If the task is not a string.
TaskNotFoundError: If the task does not exist in the list.
"""
try:
if not isinstance(task, str):
raise TypeError("Task must be a string.")
self.tasks[task]['status'] = True
webbrowser.open("well_done.html")
return "Task finished"
except Exception:
raise TaskNotFoundError("No such task in the list.")
def remove_task(self, task:str) ->str:
"""
Remove a task from the task list.
Args:
task (str): The task to remove.
Returns:
str: A message confirming that the task has been removed.
Raises:
TypeError: If the task is not a string.
TaskNotFoundError: If the task does not exist in the list.
"""
try:
if not isinstance(task, str):
raise TypeError("Task must be a string.")
del self.tasks[task]
return "Task removed"
except Exception:
raise TaskNotFoundError("No such task in the list.")
def update_task(self, task:str, new_deadline:str) -> str:
"""
Update the status and deadline of a task.
Args:
task (str): The task to update.
new_deadline (str): The new deadline for the task in dd-mm-yy format.
Returns:
str: A message confirming that the task has been updated.
Raises:
TypeError: If the task is not a string.
TaskNotFoundError: If the task does not exist in the list.
"""
try:
if not isinstance(task, str):
raise TypeError("Task must be a string.")
self.tasks[task] = {'status': False, 'deadline': new_deadline}
return "Task updated"
except Exception:
raise TaskNotFoundError("No such task in the list.")
def view_tasks(self) -> list:
"""View the tasks in the list.
Returns:
list: A list of task descriptions and their status or completion.
Raises:
TaskNotFoundError: If there are no tasks in the list.
"""
try:
task_list = []
for task in self.tasks:
if self.tasks[task]['status'] == False:
task_list.append(f"{task} by {self.tasks[task]['deadline']}")
if self.tasks[task]['status'] == True:
task_list.append(f"{task} finished")
return task_list
except Exception:
raise TaskNotFoundError("There are no tasks in the list.")
if __name__ == "__main__":
app = ToDo()
while True:
print("-------------------------------")
print()
print("1. Add task")
print("2. View tasks")
print("3. delete task")
print("4. update task")
print("5. finish task")
print("6. exit app")
print()
print("-------------------------------")
choice = int(input("Enter your choice: "))
if choice == 1:
task = input("Enter task: ")
deadline = input("Enter task deadline: ")
try:
message = app.add_task(task, deadline)
print(message)
except TypeError as e:
print(e)
except ValueError as e:
print(e)
except TaskAlreadyExistsError as e:
print(e)
elif choice == 2:
try:
print("-------------------------------")
task_list = app.view_tasks()
for task in task_list:
print(task)
print("-------------------------------")
except TaskNotFoundError as e:
print(e)
elif choice == 3:
try:
task = input("Enter the task you want to remove: ")
message = app.remove_task(task)
print(message)
except TypeError as e:
print(e)
except TaskNotFoundError as e:
print(e)
elif choice == 4:
try:
task = input("Enter the task you want to update: ")
deadline = input("What is the new deadline? ")
message = app.update_task(task,deadline)
print(message)
except TypeError as e:
print(e)
except TaskNotFoundError as e:
print(e)
elif choice == 5:
try:
task = input("Enter the task you have finised: ")
message = app.finish_task(task)
print(message)
except TypeError as e:
print(e)
except TaskNotFoundError as e:
print(e)
elif choice == 6:
print("Thanks for using")
break
else:
print("Invalid choice!")
